1. Department of Emergency Medicine, University of Alberta, Edmonton, Alberta, Canada
2. Department of Emergency Medicine, Vancouver General Hospital, Canada
3. Department of Emergency Medicine, St Paul’s Hospital, Vancouver, British Columbia, Canada
4. Department of Emergency Medicine, Lethbridge Regional Hospital, Lethbridge, Alberta, Canada
5. Ottawa Health Research Institute, Ottawa, Ontario, Canada
6. Department of Emergency Medicine, Queen Elizabeth II Hospital, Halifax, Nova Scotia, Canada
7. Department of Emergency Medicine, Foothills Medical Centre, Calgary, Alberta, Canada